Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D36/00—Filter circuits or combinations of filters with other separating devices
  • B01D36/02—Combinations of filters of different kinds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
  • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
  • B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2201/00—Details relating to filtering apparatus
  • B01D2201/04—Supports for the filtering elements
  • B01D2201/0469—Filter tubes connected to collector tubes
  • B01D2201/0484—Filter tubes connected to collector tubes suspended from collector tubes at the upper side of the filter elements

Definitions

• the invention relates to candle precoat filters for residual volume filtration consisting of a cylindrical pressure vessel with a conical bottom and filter elements arranged vertically on collecting pipes, in which at least one residual filter element is extended against the bottom.
• Candle filters of the type consist of a cylindrical housing with a conical lower part, in which several filter candles, mostly combined into registers, are installed.
• the filter candles consist of a carrier tube to which a rigid or flexible filter medium is applied. The filtration is carried out by flowing through the filter layer from the outside inwards, a filter cake being built up in tubular form on the filter medium. The filtrate flows through the carrier pipe to the outlet nozzle. The cleaning is done by brief, shock-like backflow through the filter medium.
• a candle precoat filter in which one or more filter candles are provided with a cladding tube which is open at the bottom and tightly connected to the filter candle at the top. Covered and non-covered filter cartridges are provided with separate outlet valves. If the filter inlet and outlet of the non-enveloped filter cartridges are closed and a gas is applied to the filter housing, the filter content is filtered through the enveloped filter cartridges until the level of the sludge has reached the bottom tube edge.
• the known candle filter has disadvantages. As soon as gas is applied to the filter housing with the outlet of the non-coated filter candles closed, the filter cake can fall off the non-coated filter candles depending on the composition due to the lack of differential pressure.
• the filter cake is then pressed into the narrow, circular cross-section between the tube and filter candle and clogs it very quickly. This leads to unacceptably long remaining filtration times. Even if the fallen filter cake is not pressed into the filter tube (because the lower edge of the cladding tubes is quite high in the filter housing), problems arise when cleaning the coated filter cartridges. The filter cake sticks to the inside of the cladding tube, so that the cladding tube clogs completely or partially, at least after multiple cleaning.
• the object of the invention is to improve a precoat filter in such a way that firstly no residues hinder the residual volume filtration and thus residual filtration times are achieved which are significantly shorter than the main filtration time, and secondly the residual volume remaining in the filter is designed to be variable and thus adapted to the cake volume.
• a partition wall separates the residual filter element in the upper part of the pressure container from the other filter elements in a media-tight manner and projects in the lower part beyond the length of the main filter elements.
• the filter cartridges in the residual filtration room and main filtration room have separate outlet valves. After closing the turbidity feed and the outlet of the main filter cartridges and applying gas to the main filtration chamber, it is possible to filter out the entire turbidity volume in the filtration chamber up to the lower edge of the partition wall via the remaining filter cartridges. Only when the cloud level falls below the lower edge of the partition does a gas breakdown occur and the filtration stops.
• the remaining volume in the filter housing can be designed variably in the event of gas breakthrough and can thus be adapted to the cake volume.
• the simplest version of the partition can be a flat wall that projects into a symmetrical cone. But you can also use a filter be formed symmetrical-conical lower part as a central tube or double partition.
• Fig. 1 shows a section through the filter according to the invention with a partition.
• the filter according to the invention two openings which can be closed from the outside by valves being arranged in the lower part of the dividing wall and making it possible for three different levels of the remaining volume to be set.
• Fig. 3,3a the filter according to the invention, a slot being let in in the lower part of the partition, which can be closed continuously by a slide which can be actuated from the outside.
• the filter consists of a pressure vessel 1 with a conical bottom 2.
• Residual filter elements 4 are connected via a valve pipe to a valve 11 outside the container wall.
• a partition 5 is welded into the pressure vessel and sealed against a cover 8.
• a pressure line with a valve 12 is provided in the cover 8.
• An outlet valve 9 is arranged in the apex of the cone 2, as is a line with a valve 13 for the slurry supply.
• the level of Residual volume that arises when the filter is acted on by the valve 12 is designated with item 14.
• valves 6, 6 ' in the lower part of the partition 5, from the outside by means of valves 6, 6 ', closable openings are installed, with which the level of the remaining volume 14, 14' can be changed in stages from the top edge of the top opening to the bottom edge of the partition.
• the volume of the residual filtration can be gradually reduced.
• a slot can also be made in the partition, which can be closed from the outside by a slide. As a result, the volume of the residual filtration can be continuously reduced and precisely adapted to the filter cake volume that may have fallen from the main filtration area.
• a slot 15 is let into the partition 5, which can be covered (closed) continuously by a slide 7 which can be actuated from the outside. This allows the level of the residual volume remaining in the housing after the filter has been pressurized with compressed gas from the upper edge of the slot 15 to the lower edge of the partition 5.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Filtration Of Liquid (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (1)

Family

ID=1226441

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (12)

Citations (3)

Family Cites Families (3)

• 1989
  • 1989-06-09 CH CH2169/89A patent/CH678399A5/de not_active IP Right Cessation
• 1991
  • 1991-09-10 US US08/064,168 patent/US5384034A/en not_active Expired - Fee Related
  • 1991-09-10 WO PCT/CH1991/000196 patent/WO1993004762A1/de active IP Right Grant
  • 1991-09-10 EP EP91915311A patent/EP0556188B1/de not_active Expired - Lifetime
  • 1991-09-10 DE DE59107000T patent/DE59107000D1/de not_active Expired - Fee Related

Patent Citations (3)

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